To Melt Stones
Many kinds of stones containing more or less metallic ores, can be readily melted by means of the blowpipe. When the specimens are small they can be placed upon a piece of mica, and then presented to the flame; or a clay receptacle can be made for the purpose, by simply hollowing out a small cavity in one side of a lump of clay. Large ones can be held in the hand or with the pincers as in the case of the glass melting.
—————◀▶—————